Setting up Queue Systems
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1 Setting up Queue Systems with TORQUE & Maui Piero Calucci Scuola Internazionale Superiore di Studi Avanzati Trieste March 14th 2007 Advanced School in High Performance Computing Tools for e-science
2 Outline 1 Obtaining and compiling TORQUE and Maui 2 Configuration 3 Diagnostics & Troubleshooting
3 TORQUE Source Code TORQUE is available from
4 Building TORQUE configure -prefix=/whatever/you/like make su make install not very clean, actually: quite a lot of important files go into /var/spool including configuration files! You can build only the server or MOM components, just tell --disable-mom or --disable-server My favorite install uses a directory that is shared among the masternode and the computing nodes, so that I need to build only once.
5 Maui Source Code Maui too is available from You need to register to their site to download the code, and they may contact you later and ask what are you going to do with their software (and offer commercial support for it)
6 Building Maui same «configure; make; make install» but there are a few issues with paths and options if you are linking against libpcre (recommended) you need to edit include/makefile.inc.pcre.in so that -lpcreposix -lpcre are passed as two separate options (remove quotes) if libpcre is installed anywhere but /usr/local you may need to pass some CFLAGS=-L... if your prefix is anything but /usr/local/maui you need to set --with-spooldir to have a consistent installation
7 TORQUE Common Configuration Files pbs_environment contains the environment variables for TORQUE; any minimal set will do e.g. PATH=/bin:/usr/bin LANG=en_US server_name contains the «official» name of the machine where pbs_server runs (this is usually your master node) The server name must be identical to the FQDN e.g. cerbero.hpc.sissa.it Both these files reside in the spool directory (/var/spool/torque)
8 TORQUE pbs_server configuration The nodes file server_priv/nodes contains the list of available computing nodes and a list of attributes for each node. node name # of CPUs «features» (list of arbitrary strings, can be used later to select a node type) node01 np=2 opteron myri node02 np=2 opteron myri... node51 np=4 opteron IB node52 np=4 opteron IB
9 TORQUE pbs_server configuration Creating the Configuration Database The bulk of pbs_server configuration is written in a (binary) database. You first need to create the empty database with pbs_server -t create This will destroy any existing configuration, create the empty database and start a pbs_server. Configuration can then be edited using the qmgr tool. Configuration data are written to server_priv/serverdb as well as in various other files.
10 TORQUE pbs_server configuration Sample Configuration qmgr Qmgr: create queue batch Qmgr: set queue batch queue_type = Execution Qmgr: set queue batch resources_max.walltime = 01:00:00 Qmgr: set queue batch resources_default.nodes = 1 Qmgr: set queue batch resources_default.walltime = 00:01:00 Qmgr: set queue batch enabled = True Qmgr: set queue batch started = True Qmgr: set server managers = maui@borg.cluster Qmgr: set server managers += root@borg.cluster Qmgr: set server operators = maui@borg.cluster Qmgr: set server operators += root@borg.cluster
11 pbs_mom configuration pbs_mom configuration can be fairly minimal, the only thing the Mom needs to know is the hostname where pbs_server is running on. Useful additions include log configuration, how to handle user file copy and which filesystem to monitor for available space. mom_priv/config: $clienthost master.hpc $logevent 0x7f $usecp *:/home /home size[fs=/local_scratch]
12 Maui Configuration How to Connect to Resource Manager simpler approach: a single configuration file (maui.cfg) Maui needs to know what RM to connect to and how SERVERHOST borg.cluster RMCFG[BORG.CLUSTER] TYPE=PBS RMPOLLINTERVAL 00:00:30 SERVERPORT SERVERMODE NORMAL ADMIN1 root
13 Maui Configuration Job Prioritization Job priority is recomputed at each scheduler iteration, according to site-defined parameters. If no parameters are set only queue time is taken into account, i.e. the scheduling is strictly FIFO. Priority components include: Queue Time: how long the job has been idle in the queue Credentials: a static priority can be assigned on a user, group, queue basis Fair Share: historical usage data Resources requested for the job
14 Maui Configuration Job Prioritization: Queue Time and Credentials QUEUETIMEWEIGHT 1 XFACTORWEIGHT 10 CLASSCFG[batch] PRIORITY=1 CLASSCFG[fast] PRIORITY=1000 GROUPCFG[guests] PRIORITY=1 GROUPCFG[users] PRIORITY=1000 GROUPCFG[devel] PRIORITY=10000 USERCFG[DEFAULT] PRIORITY=2000 USERCFG[luser1] PRIORITY=0
15 Maui Configuration Job Prioritization: Fair Share The FS priority component must be explicitly enabled by setting its weight to a non-sero value. FSINTERVAL duration of each FS window FSDEPTH 30 number of FS windows FSDECAY 0.90 decay factor applied to older FS windows FSWEIGHT 1 FSGROUPWEIGHT 240 FSUSERWEIGHT 10
16 Maui Configuration Job Prioritization: Fair Share Usage targets can be set on a per-user, per-group and per-queue basis. USERCFG[DEFAULT] GROUPCFG[users] GROUPCFG[devel] FSTARGET=1 FSTARGET=30 FSTARGET=40 You can set also FS floors or caps so that priority is affected only when usage drops below the floor or goes above the cap: GROUPCFG[guests] FSTARGET=5- give a negative priority component if usage is above 5% USERCFG[master] FSTARGET=20+ give a priority boost if usage is below 20%
17 Prologue & Epilogue scripts pbs_mom looks for scripts in its configuration directory mom_priv. If found, the prologue script is executed just before job start and the epilogue script at job termination. The prologue script performs any initialization that is requered on the node for the job to run, while the epilogue undoes the modifications. /etc/security/access.conf before prologue -:ALL EXCEPT root:all disallows login to everybody except root, from anywhere after prologue -:ALL EXCEPT root someuser:all now allows someuser to login
18 momctl Query and control remote pbs_mom: # momctl -d3 -h i602 Host: i602/i602.hpc Server: master.hpc Version: 1.2.0p6 HomeDirectory: /var/spool/pbs/mom_priv MOM active: seconds Last Msg From Server: seconds (DeleteJob) Last Msg To Server: 1 seconds Server Update Interval: 45 seconds Init Msgs Received: 10 hellos/2 cluster-addrs Init Msgs Sent: 190 hellos LOGLEVEL: 0 (use SIGUSR1/SIGUSR2 to adjust) Communication Model: RPP TCP Timeout: 20 seconds Prolog Alarm Time: 300 seconds Alarm Time: 0 of 10 seconds Trusted Client List:... JobList: NONE diagnostics complete
19 checknode Check who is doing what on a node and show node capabilities # checknode a034 checking node a034 State: Busy (in current state for 1:13:38:12) Configured Resources: PROCS: 2 MEM: 3949M SWAP: 7242M DISK: 59G Utilized Resources: PROCS: 2 DISK: 10G Dedicated Resources: PROCS: 2 Opsys: DEFAULT Arch: [NONE] Speed: 1.00 Load: (ProcSpeed: 2600) Network: [DEFAULT] Features: [myri][opteron][opteron-sc]... Attributes: [Batch] Classes: [smp2 2:2][smp4 2:2][mpi4 0:2][mpi8 2:2]... Total Time: 25:14:33:36 Active: 25:04:53:26 (98.43%) Reservations: Job (x2) -1:13:38:44 -> 2:10:20:16 (3:23:59:00) JobList: 30069
20
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